Tesis sobre el tema "Crossing rates"
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Hellenthal, Garrett. "Exploring rates and patterns of variability in gene conversion and crossover in the human genome /". Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/8961.
Texto completoKuo, Ping-Heng. "Channel Variations in MIMO Wireless Communication Systems: Eigen-Structure Perspectives". Thesis, University of Canterbury. Electrical and Computer Engineering, 2007. http://hdl.handle.net/10092/1212.
Texto completoFraidenraich, Gustavo 1975. "Distribuições e estatisticas de ordem superior para o canal sem fio". [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260559.
Texto completoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
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Resumo: Neste trabalho, uma nova distribuição de probabilidade amplamente geral, a distribuição a-?-?-µ, é proposta. Esta distribuição contempla como casos particulares várias outras distribuições conhecidas na literatura, tais como Rayleigh, Rice, Nakagami-m, Hoyt, Weibull, a-? (Gamma Generalizada) ?-µ e ?-µ. Por conta de sua generalidade, todos os mais importantes ambientes de desvanecimento de curto prazo são modelados por esta distribuição. Além de prover a função densidade de probabilidade para o modelo a-?-?-µ, os momentos e a função cumulativa de probabilidade também são encontrados. Este modelo geral é então especializado para quatro casos particulares, para os quais distribuições mais simples, mas ainda gerais, são encontradas: a a-?-µ, a-?-µ, ?-? Simétrica e ?-? Assimétrica. Para esses casos, estimadores práticos baseados nos momentos são deduzidos. A aplicabilidade destes estimadores é verificada utilizando medidas de campo realizadas na Unicamp com um equipamento construído no laboratório Wisstek para este ?m. Em seguida, estatísticas de ordem superior, em particular a taxa de cruzamento de nível e a duração média de desvanecimento, são encontradas de forma exata para os ambientes Hoyt e Weibull em sistemas de diversidade com M ramos desbalanceados, não idênticos e independentes utilizando os combinadores por ganho igual e por razão máxima. Neste trabalho, o resultado geral é validado através de simulações e redução das expressões gerais para casos em que os resultados já são conhecidos. Além disso, para alguns destes casos particulares, as expressões gerais são simplificadas e reduzidas a fórmulas fechadas. Estendendo esse último campo de investigação e seguindo um pioneiro trabalho da literatura, o qual abordou o caso Rayleigh, a taxa de cruzamento de nível e a duração média de desvanecimento são obtidas para ambientes Hoyt com dois ramos correlacionados. Nesta investigação, reformula-se a metodologia da literatura e obtém-se um procedimento geral para a análise da taxa de cruzamento de nível e duração média de desvanecimento em ambientes com apenas um cluster, com aplicação direta aos canais Rice, Weibull, ?-? Simétrica e ?-? Assimétrica. Finalmente, este trabalho propõe, de forma precursora, uma distribuição para a fase do canal Nakagami-m. Ao contrário do que, convencionalmente e por simplicidade, se postulava, a distribuição de fase é não uniforme e dependente de m, o que torna o modelo compatível com aqueles aproximados por Nakagami-m, nomeadamente Hoyt e Rice
Abstract: In this work, a new, very general probability density function, the a-?-?-µ distribution, is proposed. This distribution comprises, as particular cases, several other well known distributions such as Rayleigh, Rice, Nakagami-m, Hoyt, Weibull, a-? (Generalized Gamma) ?-µ and ?-µ. Due to its generality, all of the most important short fading environments can be modeled by this distribution. Besides providing the probability density function for the a-?-?-µ model, the moments and the cumulative distribution function are also found. This general model is then specialized into four particular cases, for which new simpler, though still general, distributions, are found: the a-?-µ, a-?-µ, Symmetrical ?-?, and Asymmetrical ?-?. For these cases, practical moment-based estimators are derived. The applicability of these estimators is verified using field measurements obtained through an experiment conducted at the University of Campinas (Unicamp) with an equipment specially built for this end in the Wisstek laboratory. Higher order statistics, more specifically the level crossing rates and average fade durations, are then obtained in an exact form for the Hoyt and Weibull fading environments. The results are applicable to M unbalanced, non-identical, and independent channels using equal gain and maximal ratio combining techniques. The general results are thoroughly validated by means of simulation and also by reducing the general solution to some particular cases for which the solutions are known. Moreover, new closed form expressions are also achieved for some of these particular cases. Extending this field of investigation and following a pioneering work in the literature, which approached the Rayleigh case, the level crossing rate and average fade duration are obtained considering two correlated, unbalanced, and non-identical branches in a Hoyt fading environment. In this investigation, the methodology found in the literature is reformulated and generalized so as to comprise several other cases. The general procedure developed for this analysis can now be applied to other fading environment for which one cluster of mutipaths exists, i.e., Rice, Weibull, Symmetrical ?-?, and Asymmetrical ?-?. Finally, this work proposes, in a pioneering way, the phase distribution for the Nakagami-m channel. Contrary to what conventionally, and for simplicity, was usually postulated, the phase distribution is non-uniform and dependent on m, rendering this model compatible with those approximated by Nakagami-m, namely Hoyt and Rice
Mestrado
Telecomunicações e Telemática
Mestre em Engenharia Elétrica
Azadi, Javad Raymond. "Cationic silver enhances the rate of cyclobutane pyrimidine dimer formation by increasing intersystem crossing". Connect to resource, 2009. http://hdl.handle.net/1811/36997.
Texto completoTitle from first page of PDF file. Includes bibliographical references (p. [39]-[40]). Available online via Ohio State University's Knowledge Bank.
Pimentel, Angela Bairos. "Algorithm for the Parkinson’s disease behavioural models characterization using a biosensor". Master's thesis, Faculdade de Ciências e Tecnologia, 2012. http://hdl.handle.net/10362/8443.
Texto completoThe neurodegenerative disease, Parkinson’s Disease (PD) constitutes a major health problem in the modern world, and its impact on public health and society is expected to increase with the ongoing ageing of the human population. This disease is characterized by motor and non-motor manifestations that are progressive and ultimately refractory to therapeutic interventions. The degeneration of dopaminergic neurons emanating from the substantia nigra is largely responsible for the motor manifestations. Thus, understanding the behaviour related to this disease is an added value for the diagnosis and treatment of PD. Also, in vivo models are essential tools for deciphering the molecular mechanisms underpinning the neurodegenerative process. Zebrafish has several features that make this species a good candidate to study PD. In particular, the occurrence of behavioural phenotypes of treated animals with neurotoxin drugs that mimic the disease has been investigated. And, an electric biosensor, Marine On-line Biomonitor System (MOBS) is being used for the real-time quantification of such behaviour. This equipment allows quantifying the fish movements through signal processing algorithms. Specifically, the algorithm is used for the evaluation of fish locomotion detected by a series of bursts in the domain of MOBS that correspond to the zebrafish tail-flip activity. In this thesis we proceeded to the development of an algorithm affording a electrical signal discrimination between "healthy" and "ill" zebrafish and consequently improving the detection of parkinsonism-like phenotypes in zebrafish. The first approach was the improvement of the existent algorithm. However, the first analysis failed to distinguish between different behavioural phenotypes when fish were treated with the neurotoxin 6-hydroxydopamine (6-OHDA). Consequently, we generated a new algorithm based on Machine Learning techniques. As a result, the novel algorithm provided a classification over the health condition of the fish, if the same is "healthy" or "ill" with its respective probability and the level of activity of the fish in number of tail-flips per minute. The method Support Vector Machine (SVM)was useful for the classification of the fish events. The zero crossing rate parameter was used for the characterization of the swimming activities. The algorithm was also integrated in the platform Open Signals, and for a faster evaluation of the signals, the algorithm implementation included parallel programming methods. This algorithm is a useful tool to study behaviour in zebrafish. Not only it will allow a more realistic study over the PD research area but also test and assess new drugs that use zebrafish as animal model.
Gathy, Maude. "On some damage processes in risk and epidemic theories". Doctoral thesis, Universite Libre de Bruxelles, 2010. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210063.
Texto completoEn théorie du risque, le processus de détérioration étudié est celui des sinistres supportés par une compagnie d'assurance.
Le premier chapitre examine la distribution de Markov-Polya comme loi possible pour modéliser le nombre de sinistres et établit certains liens avec la famille de lois de Katz/Panjer. Nous construisons la loi de Markov-Polya sur base d'un modèle de survenance des sinistres et nous montrons qu'elle satisfait une récurrence élégante. Celle-ci permet notamment de déduire un algorithme efficace pour la loi composée correspondante. Nous déduisons la famille de Katz/Panjer comme famille limite de la loi de Markov-Polya.
Le second chapitre traite de la famille dite "Lagrangian Katz" qui étend celle de Katz/Panjer. Nous motivons par un problème de premier passage son utilisation comme loi du nombre de sinistres. Nous caractérisons toutes les lois qui en font partie et nous déduisons un algorithme efficace pour la loi composée. Nous examinons également son indice de dispersion ainsi que son comportement asymptotique.
Dans le troisième chapitre, nous étudions la probabilité de ruine sur horizon fini dans un modèle discret avec taux d'intérêt positifs. Nous déterminons un algorithme ainsi que différentes bornes pour cette probabilité. Une borne particulière nous permet de construire deux mesures de risque. Nous examinons également la possibilité de faire appel à de la réassurance proportionelle avec des niveaux de rétention égaux ou différents sur les périodes successives.
Dans le cadre de processus épidémiques, la détérioration étudiée consiste en la propagation d'une maladie de type SIE (susceptible - infecté - éliminé). La manière dont un infecté contamine les susceptibles est décrite par des distributions de survie particulières. Nous en déduisons la distribution du nombre total de personnes infectées à la fin de l'épidémie. Nous examinons en détails les épidémies dites de type Markov-Polya et hypergéométrique. Nous approximons ensuite cette loi par un processus de branchement. Nous étudions également un processus de détérioration similaire en théorie de la fiabilité où le processus de détérioration consiste en la propagation de pannes en cascade dans un système de composantes interconnectées.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished
Gale, Brittany Herrod. "Effects of Predation Environment and Food Availability on Somatic Growth in the Livebearing Fish Brachyrhaphis rhabdophora (Pisces: Poeciliidae)". BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3430.
Texto completoSuh, Seong-Youp. "A Propagation Simulator for Land Mobile Satellite Communications". Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36632.
Texto completo
This report describes a simulator, PROSIM, developed at Virginia Tech for simulating a propagation model in land mobile satellite communications. The simulator is based on a random number generator that generates data sets to compute statistics of the propagation channel. Performance of the simulator was evaluated by comparing statistics from an analytical model and experimental data provided by W. Vogel of Univ. of Texas at Austin and J. Goldhirsh of the Applied Physics Laboratory. New expressions for phasor plot and its mathematical expression for lognormal channel were derived and were simulated. Finally, the advantages of the simulator using random number generator in simulating the propagation model are described.
Master of Science
Costa, Daniel Benevides da. "Estatisticas de ordem superior para canais de desvanecimento Weibull e Nakagami-m". [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261823.
Texto completoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
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Resumo: Esta dissertação provê uma análise das estatísticas de ordem superior para canais de desvanecimento WeibuII e Nakagami-m. Considerando canais de desvanecimento WeibulI, devido à ausência de um modelo físico para tais canais, estatísticas conjuntas de duas variáveis WeibuII correlacionadas foram obtidas em forma fechada e em função de parâmetros físicos bem conhecidos. Outra estatística encontrada foi a taxa de cruzamento de nível e a duração média de desvanecimento usando diversidade com dois ramos para canais WeibuII correlacionados, desbalanceados e não-idênticos. Além disso, uma caracterização do comportamento do processo de fase e de sua derivada temporal para sinais WeibuII foi realizada. Analisando canais de desvanecimento Nakagami-m, uma expressão simples e em forma fechada para a taxa de cruzamento de fase generalizada foi obtida. Resultados de simulação completamente validaram a formulação proposta. Além disso, novas estatísticas em forma fechada para a envoltória, para as componentes em fase e em quadratura, para a fase e para suas respectivas derivadas temporais foram obtidas
Abstract: This dissertation provides an analysis of the higher order statistics for WeibuII and Nakagami-m fading channels. Conceming WeibuII fading channels, due to the absence of a fading model related of such channels, joint statistics for two correlated WeibuII variates were obtained in cIosed-form and in terms of welI-known physical parameters. Other statistics found were the levei crossing rate and the average fade duration for unbalanced, non-identical, correlated WeibuII channels operating over two branches of diversity. Furthermore, a characterization of the behaviour of the phase process and its time derivative for WeibuII signals was accomplish. Conceming Nakagami-m fading channeIs, a simple and cIosed-form expression for the generalized phase crossing rate was obtained. Results of simulation thoroughly validated the formulation proposed. Moreover, new cIosed-form statistics for the envelope, for the in-phase and quadrature components, for the phase and its respective time derivative were derived.
Mestrado
Telecomunicações e Telemática
Mestre em Engenharia Elétrica
Mousselon, Laure. "Radio Wave Propagation Measurements and Modeling for Land Mobile Satellite Systems". Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/10155.
Texto completoMaster of Science
Kovařík, Jiří. "Detektor řečové aktivity v signálovém procesoru". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219784.
Texto completoPetit, Morgane. "Etude des patrons de recombinaison, de leur déterminisme génétique et de leurs impacts en sélection génomique". Thesis, Toulouse, INPT, 2017. http://www.theses.fr/2017INPT0083/document.
Texto completoGenetic recombination is a fundamental biological process, which occurs during the meiosis. It allows the good segregation of the chromosomes and contributes to maintain the genetic diversity. Recombination was already studied in a lot of different species, especially in mammals and in farm animals, such as the pig, the cattle or the sheep. In each case, a variation of the recombination rate between the individuals was observed. This variation was heritable and under genetic determinism. In some species, genetic recombination maps were also created, which allowed to localize the crossovers and to detect really tiny genomic regions where the recombination is huge: the recombination hotspots. In the Lacaune breed sheep, a lot of genotyping data are available thanks to two existing arrays: a first with a medium density of markers (about 54,000 markers) and a second with a high density of markers (about 600,000 markers). Two datasets were thus available: a familial dataset with about 6,000 animals genotyped for the 54,000 markers and a dataset of 70 unrelated Lacaune genotyped for the 600,000 markers. Genetic recombination maps were created for these two datasets. With the 70 unrelated Lacaune, about 50,000 hotspots were detected. The familial dataset allowed to observe the mammals common recombination patterns. Finally, when the two datasets were combined, selection signatures were revealed and a high density recombination map were created. Furthermore, a variation of the recombination rate within the individuals was observed and was associated to 2 main QTLs on the chromosomes 6 and 7. Already known, or not, candidate genes were proposed and sometimes studied: especially RNF212 and HEI10. Finally, a comparison with another sheep breed revealed that the genetic recombination maps were really similar, but the individual recombination rate was under a different genetic determinism. A concrete application of the genetic recombination map in genomic selection was also proposed thanks to the creation of lowdensity SNPs sets, which could be used to impute the animals and thus to improve the genotyping and the genomic selection for lessercosts
Rodrigues, Doriane Picanço. "Diversidade genética e sistema de reprodução progênies elites de Pupunheira Inerme (Bactris gasipaes KUNTH) com marcadores microssatélites: Implicações para o melhoramento do palmito". Universidade Federal do Amazonas, 2006. http://tede.ufam.edu.br/handle/tede/3061.
Texto completoFundação de Amparo à Pesquisa do Estado do Amazonas
The peach palm (Bactris gasipaes Kunth var. gasipaes) is a domesticated Neotropical palm that is important as a cultivated source of heart-of-palm. The genetic base for this agribusiness is the Pampa Hermosa landrace, Yurimaguas, Peru, that supplies the absolute majority of the seeds used in the expansion of the agribusiness and the improvement programs in Brazil, because its plants are spineless and more productive than those of other landraces. The use of molecular markers will permit better discrimination among populations and progenies of the landrace, guiding the selection of elite individuals and the search for hybrid vigor via maximization of heterozygosity within the landrace. This study evaluated the genetic diversity, population structure, and genetic relations among progenies and populations in a progeny trial maintained at INPA, Manaus, Amazonas, as well as the mating system of the peach palm using eight microsatellite loci, to support the improvement programs that use these genetic resources. Samples from three populations of the Pampa Hermosa landrace and from the market of Yurimaguas were collected from 12 progenies from the Cuiparillo River (n=140), 12 from the Paranapura River (n=130), nine from the Shanusi River (n=130), and 17 from the market at Yurimaguas (n=168). The sampling concentrated on plants (121) selected for heart length, and included non-selected plants (447). High genetic variability exists in the progeny trail, with a mean of 15.1 alleles per locus and total diversity (HT) equal to 0.82. The eight loci had 12 common alleles and 26 intermediate-frequency alleles found in all the populations and the market, and 83 alleles scattered among populations, with 14 private alleles. The observed heterozygosity (Ho) in the trail was less than the He in the majority of the loci; in locus Bg02-08 Ho was very inferior, suggesting a strong excess of homozygotes in this locus. The Ho was lowest in Shanusi (0.64) and highest in Paranapura (0.74). The inbreeding coefficient f varied among populations and market, and was highest in Shanusi (0.190) and lowest in Paranapura (0.111). Genetic divergence among the populations and the market was low (formula), certainly due to high gene flow (9.8 migrants per generation). The AMOVA detected 82.8% of the total variation within the progenies, 16% among the progenies within the populations and market, and only 1.3% among the populations and the market, describing a weak genetic structure and suggesting that the populations and the market are highly related. This relationship was confirmed by the dendrograms of the DAS genetic distances among the populations, with a greater proximity between the populations of Paranapura and Cuiparillo, and between the Mercado and Shanusi. The dendrogram of the DAS genetic distances showed high genetic affinity among the progenies and the formation of groups independent of their geographic origin. The Ho and He were high for the majority of the progenies, confirming high genetic variability within the progenies. The inbreeding coefficient (f) for the progeny trial was not different from zero, confirming an excess of heterozygotes and confirming the high variability observed from the estimates of heterozygosity. The analysis of the mating system found that the species is predominantly allogamous. The high out-crossing rate demonstrates that the progenies are derived almost exclusively from individuals experiencing out-crossing, probably due to the harvest representing the peak of the flowering season and to the synchronism of flowering associated with the behavior of the pollinator. The estimates of crossing among relatives (tm - ts) were significant (0.101 to 0.202), suggesting some biparental inbreeding, probably due to the farmers practice of planting open-pollinated seeds of only a few seed sources in the same plot. The estimate of paternity correlation was low (varying from 0.051 to 0.112), suggesting a small number of full sibs within the progenies and large number of pollen sources (9 to 20) participating in the crosses. The progenies of the trial are composed mainly of half sibs with great genetic variability, enhanced by the large number of pollen sources, and suggests that selection for heart-of-palm production could be based on the classic models of quantitative genetics applied to exclusively allogamous species. This information will be used to guide the crosses among progenies/populations. Two improvement plans are feasible with this information: population improvement, with crosses among highly divergent plants and progenies; by reciprocal recurrent selection, with the creation of divergent populations based on morphometric and genetic information.
A pupunheira cultivada (Bactris gasipaes Kunth var. gasipaes) é uma palmeira domesticada que vem se destacando como produtora de palmito. A base genética para o agronegócio vem da raça primitiva Pampa Hermosa, Yurimáguas, Peru, que fornece a maioria absoluta das sementes usadas na expansão do agronegócio e nos programas de melhoramento no Brasil, devido a possuir plantas sem espinho que são mais produtivas que as de outras raças. O uso de marcadores moleculares possibilitará discriminar com maior confiabilidade entre populações e progênies, orientando a seleção de matrizes e a busca de vigor híbrido via maximização de heterozigosidade dentro da raça. Este trabalho avaliou a diversidade e a estrutura genética, as relações genéticas entre as progênies e o sistema de reprodução de pupunheira da raça Pampa Hermosa, usando oito loci microsatélites, para apoiar os programas de melhoramento que usam estes recursos genéticos. Foram coletadas amostras de três populações de pupunheira da raça Pampa Hermosa e do mercado de Yurimáguas mantidas no ensaio de progênies do INPA, sendo 12 progênies do rio Cuiparillo (n=140), nove do rio Shanusi (n=130), 12 do rio Paranapura (n=130) e 17 do mercado de Yurimáguas (n=168). A amostragem concentrou-se em plantas selecionadas (121) para comprimento do palmito e não selecionadas (447). Existe alta variabilidade genética nas progênies do ensaio, com média de 15,1 alelos por loci e diversidade total (HT) igual a 0,82. Os oito loci apresentaram 12 alelos comuns e 26 alelos intermediários presentes em todas as populações e o mercado, e 83 alelos raros, sendo 14 privados, 10 esporádicos e 62 difundidos. As heterozigosidades observadas (Ho) no conjunto de plantas foram inferiores a heterozigosidade esperada (He) na maioria dos loci; no lócus Bg02-08 Ho foi muito inferior, sugerindo forte excesso de homozigotos neste lócus. A Ho foi menor em Shanusi (0,64) e maior em Paranapura (0,74). Os coeficientes de endogamia variaram entre populações e mercado, sendo maior em Shanusi (0,190) e menor em Paranapura (0,111). Detectou-se baixa divergência genética entre as populações e o mercado (fórmula), certamente devido ao alto fluxo gênico (9,8 migrantes por geração). A AMOVA detectou 82,8% do total da variação dentro das progênies, 16% entre as progênies dentro das populações e o mercado, e somente 1,3% entre as populações e o mercado, confirmando uma estrutura genética mínima e sugerindo que as populações e o mercado são altamente relacionadas. Este relacionamento foi confirmado pelos dendrogramas de distâncias (DAS) das populações, o qual mostra maior proximidade entre as populações de Paranapura e Cuiparillo, e entre o mercado e Shanusi. O dendrograma das progênies mostra alta afinidade genética e formação de grupos independentes de sua área geográfica de origem. As heterozigosidades observadas (Ho) e esperadas (He) foram altas para a maioria das progênies, evidenciando alta variabilidade genética dentro das progênies. O coeficiente de endogamia (f) para o conjunto de progênies não foi diferente de zero, evidenciando excesso de heterozigotos e confirmando a alta variabilidade observada pelas estimativas de heterozigosidade. A análise do sistema de reprodução revela que a espécie é predominantemente alógama. As altas taxas de cruzamento demonstram que as progênies são oriundas quase que exclusivamente por indivíduos provenientes de exocruzamento, provavelmente devido ao estágio fenológico (pico da safra) e ao sincronismo de floração associado ao comportamento do polinizador. Porém, as estimativas (tm - ts) foram significativas (0,101 a 0,202), evidenciando endogamia biparental, provavelmente decorrente da prática agrícola de plantar sementes de polinização aberta de poucas matrizes na mesma roça. A estimativa da correlação de paternidade foi baixa (variando de 0,051 a 0,112), indicando pequena proporção de irmãos-completos dentro das progênies e grande número de doadores de pólen (9 a 20) participando dos cruzamentos individuais. Portanto, as progênies do ensaio são compostas em sua maioria por meios-irmãos com elevada variabilidade genética, evidenciada pelo alto número de doadores de pólen, e sugere que a seleção para produção de palmito poderá ser baseada nos modelos clássicos de genética quantitativa aplicados para espécies exclusivamente alógamas. Essas informações serão utilizadas para orientar os cruzamentos entre e dentro de progênies/populações. Dois planos de melhoramento são factíveis com essa informação: melhoramento populacional, com cruzamentos entre plantas e acessos altamente divergentes; melhoramento por meio de seleção recorrente recíproca, com a criação de populações divergentes em termos morfométricos e genéticos.
Fu, Ruijun. "Empirical RF Propagation Modeling of Human Body Motions for Activity Classification". Digital WPI, 2012. https://digitalcommons.wpi.edu/etd-theses/1130.
Texto completoOkuyucu, Cigdem. "Semantic Classification And Retrieval System For Environmental Sounds". Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12615114/index.pdf.
Texto completoKratz, Marie. "Some contributions in probability and statistics of extremes". Habilitation à diriger des recherches, Université Panthéon-Sorbonne - Paris I, 2005. http://tel.archives-ouvertes.fr/tel-00239329.
Texto completoShang, Lei y lei shang@ieee org. "Modelling of Mobile Fading Channels with Fading Mitigation Techniques". RMIT University. Electrical and Computer Engineering, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20061222.113303.
Texto completoBeck, Andre Teofilo. "Reliability Analysis of Degrading Uncertain Structures - with Applications to Fatigue and Fracture under Random Loading". Thesis, 2003. http://hdl.handle.net/1959.13/24731.
Texto completoPhD Doctorate
Beck, Andre Teofilo. "Reliability Analysis of Degrading Uncertain Structures - with Applications to Fatigue and Fracture under Random Loading". 2003. http://hdl.handle.net/1959.13/24731.
Texto completoPhD Doctorate
Etinski, Mihajlo [Verfasser]. "Comparison between time-dependent and time-independent methods for the calculation of inter-system crossing rates : application to uracil and its derivatives / vorgelegt von Mihajlo Etinski". 2010. http://d-nb.info/1006635491/34.
Texto completoShenoy, Ravi R. "Spectral And Temporal Zero-Crossings-Based Signal Analysis". Thesis, 2016. http://etd.iisc.ernet.in/handle/2005/2660.
Texto completo田明杰. "Speech and Non-Speech Classification Using Zero Crossing Rate of Autocorrelation Function". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/09062056114210554331.
Texto completo國立清華大學
統計學研究所
91
In this thesis, we propose two new features for the classification of a speech frame into a voiced or an unvoiced frame. The first one is the zero crossing rate of a frame after rainfall. This helps to classify a silence frame from speech frames. The second feature is the zero crossing rate of the double autocorrelation function of a frame. This helps to classify a voiced frame from speech frames. The zero crossing rate of the double autocorrelation function is also shown more robust than the ordinary zero crossing rates. The zero crossing rates after rainfall is somewhat a replacement of the feature energy for the classification of speech / non-speech frames. These two features are extensive tested by the TIMIT speech database, and the correct rate is 92.4%.
Stevison, Laurie S. "Causes and Consequences of Recombination Rate Variation in Drosophila". Diss., 2011. http://hdl.handle.net/10161/3908.
Texto completoRecombination occurs during meiosis to produce new allelic combinations in natural populations, and thus strongly affects evolutionary processes. The model system Drosophila has been crucial for understanding the mechanics underlying recombination and assessing the association between recombination rate and several evolutionary parameters. Drosophila was the first system in which genetic maps were developed using recombination frequencies between genes. Further, Drosophila has been used to determine genetic and environmental conditions that cause variation in recombination rate. Finally, Drosophila has been instrumental in elucidating associations between local recombination rate and nucleotide diversity, divergence and codon bias, as well as helping determine the causes of these associations.
Here I present a fine-scale map of recombination rates across two major chromosomes in Drosophila persimilis using 181 SNP markers spanning two of five major chromosome arms. Using this map, I report significant fine-scale heterogeneity of local recombination rates. However, I also observed "recombinational neighborhoods", where adjacent intervals had similar recombination rates after excluding regions near the centromere and telomere. I further found significant positive associations of fine-scale recombination rate with repetitive element abundance and a 13-bp sequence motif known to associate with human recombination rates. I noted strong crossover interference extending 5-7 Mb from the initial crossover event. Further, I observed that fine-scale recombination rates in D. persimilis are strongly correlated with those obtained from a comparable study of its sister species, D. pseudoobscura. I documented a significant relationship between recombination rates and intron nucleotide sequence diversity within species, but no relationship between recombination rate and intron divergence between species. These results are consistent with selection models (hitchhiking and background selection) rather than mutagenic recombination models for explaining the relationship of recombination with nucleotide diversity within species. Finally, I found significant correlations between recombination rate and GC content, supporting both GC-biased gene conversion (BGC) models and selection-driven codon bias models.
Next, I looked at the role of chromosomal inversions in species maintenance by examining the impact of inversions distinguishing species to disrupt recombination rates within inverted regions, at inversion boundaries and throughout the remainder of the genome. By screening nearly 10,000 offspring from females heterozygous for 3 major inversions, I observed recombination rates within an inverted region in hybrids between Drosophila pseudoobscura and D. persimilis to be ~10-4 (similar to rates of exchange for inversion heterozygotes within species). However, despite the apparent potential for exchange, I do not find empirical evidence of ongoing gene exchange within the largest of 3 major inversions in DNA sequence analyses of strains isolated from natural populations. Finally, I observe a strong 'interchromosomal effect' with up to 9-fold higher (>800% different) recombination rates along collinear segments of chromosome 2 in hybrids, revealing a significantly negative association between interchromosomal effect and recombination rate in homokaryotypes, and I show that interspecies nucleotide divergence is lower in regions with larger changes in recombination rates in hybrids, potentially resulting from greater interspecies exchange. This last result suggests an effect of chromosomal inversions on interspecies gene exchange not considered previously.
Finally, I experimentally tested for a novel male-mediated effect on female recombination rates by crossing males that differed by either induced treatment variation or standing genetic variation to genetically identical females. After assaying recombination frequency in the offspring of these genetic crosses, I fitted these data to a statistical model where I showed no effect of male temperature treatment or male genetic background on offspring recombination rate. However, I did observe a difference of recombination rates of offspring laid 5-8 days post-mating between males treated with Juvenile Hormone relative to control males. Environmental variation in male ability to affect recombination rate in their mates suggests the potential for sexual conflict on optimal proportion of recombinant offspring, perhaps leading to changes in population-level recombination rates with varying levels of sexual selection.
Overall, my map of fine-scale recombination rates allowed me to confirm findings of broader-scale studies and identify multiple novel features that merit further investigation. Furthermore, I have identified several similarities and differences between inversions segregating within vs. between species in their effects on recombination and divergence, and I have identified possible effects of inversions on interspecies gene exchange that had not been considered previously. Finally, I have provided some evidence that males may impact female recombination rates, although future work should attempt to explore the range of male differences that impact this trait and the mechanism through which males impact the outcome of female meiosis.
Dissertation
Chen, Sih-Huei y 陳思慧. "Heart rate and pulse transit time analysis of leg crossing on meditation practitioner". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/74433274291724210648.
Texto completo亞洲大學
光電與通訊學系碩士班
98
Meditation common in many developing countries and developed countries, the Republic of China is also commonly associated with the research report, it means using sit-ins, to observe the practice in the long meditation of the 15 students did not receive meditation training with 14 students in the sitting cross-legged sitting position with legs straight, the acquisition of heart rate variability and pulse transmit time and the two parameters was found in the cross-legged posture control pulse transmit time on average there are significant differences, and Zen No fixed group; the results and assumptions control group meditation practice in a long time, change in position, the curved legs crossing over in the blood flow on unimpeded. While the movement experiment, using to fling hand and kicking, this action can be cast in a small space stretching, observation of pulse transmit time parameter is the value after exercise on reducing the trend; swing experiments of many parameters have values reduce the trend after exercise, kicking foot experiment data pulse transmit time averages have numerical decrease after exercise, but not obvious. Therefore, we can find parameters of pulse transmit time in the leg crossing posture on heart rate variability parameters than do more of the information available, and in the movement, speed up blood circulation in the body of assumptions, not significantly different, but still can see a trend. Pulse transmit time and the physiological parameters measured in only one non-invasive sensors, heart rate variability than pure parameters can describe a number of related phenomena.
Lin, Yu-Fei y 林禹菲. "Stock Index Forecast via a Recurrent Neural Network Base on the Zero-Crossing Rate Approach". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/h748v9.
Texto completoChen, Yan-Hong y 陳彥宏. "The Analysis of Autonomic Nervous System Using Higher Order Crossings of Heart Rate Variability". Thesis, 1999. http://ndltd.ncl.edu.tw/handle/03197069364853622614.
Texto completo逢甲大學
自動控制工程學系
87
The spectral analysis method based on short-term fast Fourier transform of heart rate variability (HRV) is employed for analysis of autonomic nervous functions in this research. In the past, the extent in frequency domain of HRV for evaluation of sympathetic site was considered to distribute at the range from 0.04 Hz to 0.15 Hz, and the vagal activities was evaluated at the spectral range of HRV from 0.15 Hz to 0.5 Hz. However, these fixed analytic extents would not be suitable at some special spectrum distribution when the sympathetic activities higher then 0.15 Hz, or the vagal activities lower then 0.15 Hz. In this research, the analysis of autonomic nervous function based on higher order crossings (HOC) of HRV is presented. The natural frequency of HRV is estimated by HOC. The very low frequency, low frequency and high frequency are obtained from higher-order crossings of HRV series with filtering processes. Through the frequency response analysis, the analytic bandwidth is decided. The comparison of the analytic results between applying fixed bandwidth and using regulable bandwidth was made. According to the experiment of breathing control, fixed bandwidth would not be suitable to use when the vagal activities lower then 0.15 Hz, but regulable bandwidth could still separate the sympathetic site from the vagal activities. The proposed methods have shown the improvement of analytic results for assessment of the autonomic nervous system.
Best, Chris. "Measurement of Fuel Regression Rate of a Pool Fire in Crosswind With and Without a Large Downwind Blocking Object". Thesis, 2010. http://hdl.handle.net/10012/5232.
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